*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
ul{
    list-style: none;
}
html{
    height: 100%;
}
body{
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.tabs ul{
    display: flex;
    position: relative;
    z-index: 5;
}
.tabs li{
    border: 1px solid #000;
    border-radius: 10px 10px 0 0;
    width: 120px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    margin-right: 16px;
    border-bottom: none;
}
.tabs .contents{
    border: 1px solid #000;
    width: 550px;
    height: 200px;
    padding: 20px;
    background-color: #ddd;
    position: relative;
    top: -1px;

}
.tabs .contents .con{
    display: none;
}
.active{
    background-color: #ddd;
}